Thats great you've got good swelling from this!
Try the noogleberry forums I think there were a few ideas for diy padding on cups there I think I saw someone say they used bluetak or I think the noogleberry ones are they foam because you could maybe cut to size or silicon tubing if sliced down lengthways to open it out so could fit over the edges of cups and just blue tak in place or what about that stuff zubber like kids modeling clay but turns rubbery well still check there forum for better idea these I thought up on the spot lol.
Try the noogleberry forums I think there were a few ideas for diy padding on cups there I think I saw someone say they used bluetak or I think the noogleberry ones are they foam because you could maybe cut to size or silicon tubing if sliced down lengthways to open it out so could fit over the edges of cups and just blue tak in place or what about that stuff zubber like kids modeling clay but turns rubbery well still check there forum for better idea these I thought up on the spot lol.